Cast-iron boiler.



A. B. BECK.

CAST IRON BOILER.

APPLICATION FILED KOV.30,1907.

905,366. 7 Patented Dec. 1, 1908.

3 SHEETS-SHEET 1.

II I

- //v vr/v 7'01? WI-TA/ESSES A. B. BECK.

CAST IRON BOILER.

APPLICATION FILED 11031.30. 1907.

Patented Dec. 1, 1908.

3 SHEETS-11351 3.

ANPERS VBORQB- BE F lEL LD NM-ABK.

oas'r-mou sonata.

mwoe see.

To all whom it may concern: Be it known that I, Animus Boson BEGK,

captain, citizen of Denmark, residing at Christiansvej 16, Hellerup, in the Kingdom of Denmark, have invented new [anduseful improvements in Cast-Iron Boilers, of which the following is a specification.

Ithas been proposed to build cast iron boilers in sections having such a form and connected in such a manner that the area of the grate and to some extent the area of the flue vary proportionately with the numberof sections employed. Such boilers can also, as

is known, be supplied with a fuel magazine situated above the combustion space, the size of which may be varied proportionally to the number of sections.

The present invention relates to boilers of this class. I 1

Owing to the form-of the sections hitherto used, it has not been possible to obtain a I J practical arrangementof a. sloping or vertical grate, andconsequentlyhorizontal grates.

have exclusively been used. For; cast iron boilers which have to be run fora prolon ed period without attention and for boi ers using bituminous fuel it is of great importance that the grate should not become easily chokedb'y ashes and clinkers as is the case with horizontal grates, and thatthe grate should be so arranged that the incombustible part of the fuel may be collected at the bottom of the furnace without interference with the combustion. This result has been achieved-in wrought iron boilers by-using a sloping and partly vertical grate, and this is the arrangement which is .ap lied to sectiona'l cast iron boilers such-as a ve'referred -to, which according to the present invention ,aresoconstructed as to allow a practical arrangement-of a sloping or a partly sloping and partly vertical grate. This is achieved byconstructing the various sections of which the boilerconsists with the ash-pit door,

thr'ou h which the grate is attended to, :place atrighta sectionsthedept of the furnace and conles to the side walls of the seqnently the form and length of the grate jbemg constant whether theboiler consists 0L two or more than two sections. Byhaving the de th-of the furnace-the-same whether i the boiler has few or many sections, itbeomespmible to use in cast'iron'bollersof thisclass either-a vertical .v to or agrate @which' ispartl -vertical an partl-ysloping,

the length an slope being dependent ion the Specification of Letters Patent. a nmimm a a munso, 1907. sum no. team.

and .coul bothabove and below as shown in Fig. 3 or section to.

I t ted nefi, 10cc.

number of-sections, while the numberiof sections.

The following description and theaccompanying drawings-show examples of-the said invention. I

Figure 1 shows a vertical section, taken its area varies with between two boiler sections, of a boiler having sloping and loose grate bars which is especially a apted for firing with bituminous fuel. Fig. 2 shows a sectional plan section of the same boiler consisting of two middle sections and two side sections. Fig. 3 shows a vertical section through a boiler especially adapted for firing with coke and supplied with a grate formed in steps. Fig. ishowsa sectional plan section of the boiler of Fig. 3. Figs. 5, 6 and 7 show details of how the front partitions of the middle sections can be made if they are made as independent castings, 1 f The boiler is constructed in the known mannerof separate sections, two side sections a, and one ormore middle sections I). As shown in Fig. l-the middle sections can be constructed in one piece to form both front and'rear portions of the boiler and having a large hollow space between the two side sections partly forming the fuel magazine cand partly the combustion. chamber 11 and the ash-pita. Thefront of -the magazinec is constitutedby the'water filled front portions frof the sections, .whichdn .Fig. 1

are shown asbagsor-pockets connected only i at their upper ends with the rear water. space parts of the sectio1 1s.by horizontalpassages a 3 but they could also be-inde ndentcastings be connected to t e gside sections onl above as shown in5, Band 7. The sai horizontal connections 3 Fig. .1' between the front and rear parts are narrow with intervals; between them, through which the fuel can be charged intorthe el magazine. The lower part of the front water. spaceof the sectionsisinclinedtowards the eombus tionzchamber in asloping direction and is V more'narr'ow than the remaining part of ,the

rovide intervalsbetween theses. v

tions in .w 'ch the. grate h areplaced,

\and is further provided with ='pro ecting supportafor the. grate has It The supports 7 for the grate-bars in manner he kepheoo th 1s..i ,=of.gmt 1mp ed by the water-"of the boiler, and

especially in the as; of the esagrm bar,'-which might bustion chamber d and at the other end into I parts f will also act, as shown in Figs. land 3, as a vertical grate,

. in Fig. 1, a vertical partition wall 2' may be soon be destroyed if not cooled by water. As the grate bars themselves have usually very considerable durability and can moreover be easily replaced if necessary, this cooling is of the greatest importance, and this also applies to the water cooled bottom 2 of the ash-pit. Besides the sloping grate formed by the grate bars it some of the front whereby theprimary combustion air can enter into the fuel magazine on the lower part ofits vertical front. wall, which is of great importance to boilers which have to be run without attention for a prolonged period; as it is evident that in any case the vertical part'of the grate may very easily be choked up by ashes and clinkers which by and by fall to the bottom as the combustion is effected.

In order to get the best circulation of the water in the bag-shaped front part as shown placed in the water space of this front wall as shown by dotted lines in Fig. 1. As aforesaid the Figs. 5, 6, and 7 show a construction of the front partitions f in such cases where they are made as independent castings, and they further show a verticalpartition wall 2' in order to obtaina ood circulation of the-water through the out portions. In order to force the water in a fixed direction through the front portions, the partition wall in one of the outer front portions is led quite up to the top while the partition walls in the other portions do not quite reach the top. From the combustion chamber cl the combustion products are led through the fines 5:. As shown by the figures the lines are arranged in such a manner that each pair of sections has its own system of lines which at one end open into the com-.

a common flue 1 leading to a chimney. The fines k are made as long as possible in proportion to the size of the boiler section so as to offer the maximum heating surface to the water. Accordingly the lines are given the S-form shown in Figs. 1. and 3, which also has the advantage thatthe cleaning of the fines can easily be done through a door we situated opposite the upper bend of the S in the rear of each pair of sections, the partitions n between the separate fines of which the flue system of each section consists stopping short on each side of the door m forv this purpose. The special form given to the flues also enables a fuel magazine of large capacity to be provided in the boiler sections. The ash-pit door 25 is placed'in front of the ash-pit and the grate and may be "double. walled as shown in-Figs. 1 and 2 in order to enable the primary'co'mbustion air to be preheated by passing through-the'channel 10, made for that puipose, in the door, thereby l which are situated between utilizing the heat which would otherwise radiate from the front art of the boiler.

An additional supp y of air for combustion may be provided for boilers in which it is desired to burn bituminous fuel. As shown in Figs. 1 and 2 it is admitted through a horizontal channel 0 which is led through brickwork p placed between the tongues r in front of the fines k and resting on the ribs 41:. The said horizontal channel 0 may be placed in communication withone or several vertical channels u which are led up through the side sections a where they are lined on the furnace side'by the fireproof brickwork 8 (see Fig. 2) the air supply being regulated by a valve. In passing through these verw tical channels the secondary combustion. air

is heated intensely by radiation from the brickwork 8 before it reaches the channel 0 whence it finally passes into the combustion chamber through the opening q.

Boilers which are not intended to be fired by bituminous fuel do not require the secondary supply of air and the channels 0 and u as well as the fire-proof brickwork p and s can be omitted as shownin Fi 3.

Instead of using the loose inclined grate bars as shown in Fig. 1 other grate arrangements may be substituted, as'for example the stair grate shown in Fig. 3, which may consist either of loose steps or of ribs afiixed to the front parts f and the side sections a.

Having now described my invention, what I claim as new and desire te'rs Patent is:

1. In a sectional cast iron boiler-for steam or hot water the combination of a slopin grate, grate'bars, a fuel magazine situate above the grate, endand middle-sections touching one another in planes placed at right angles to the front wall of the'boiler, the said middle-sectio1is having water filled front portions f, lining the front part of the fuel magazine and having their lower part sloping down against'the rear and forming water cooled supports for the grate-bars the lower parts of the said front ortions f, said supports having intervals Eetween their rear ends and the bottom of the ash-pit in such a manner that ashes and clinkers can be drawn out of the combustion chamber through said intervals. I 1

2. In a sectional cast iron boiler for steam or hot water the combination of a slopin grate, grate bars, a fuel magazine situated above the grate, endand middle-sections.

touching one. another in fplanes placed at right angles to the front wall of the boiler the said middle-sections having water filled front portions f, lining the front part of the fuel magazine and having their lower part sloping down against the rear and forming water" cooled supports for grate-bars to secure by Letloo having intervals of the said front which are situated between the lower parts of the said' front ortions f, said supports etween their rear ends and the bottom of the ash-pit in such a manner that ashes and clinkers can be drawn out of the combustion chamber through said intervals, a horizontal main flue.l and smoke-fines is between the sections of the boiler, the said flues commencing in the combustion chamber. (1' and ending in the horizontal main flue l. a I

3. In a sectional cast iron boiler for steam or hot water the combination of a slopin grate, grate bars, a fuel magazine situate above the grate, endand middle-sections touching one another in planes placed at right angles to the front wall of the boiler, the said middle-sections having water filled front portions if, lining the front art of the fueLma azine and having their ower part sloping own against the rear and forming water cooled sup orts, for the grate-bars which are situated between the lower parts ortions 1, said supports having intervals ner that ashes and clinkers can be drawn out of the combustion chamber throu h said intervals, a horizontal main flue and smoke-fines In between the sections of. the I boiler, the said fiues commencing in the com-4 bustion chamber 01 and ending in the horitween their rear ends and the bottom of the ash-pit in such a man grate, grate bars, a fuel magazine situate above the grate, zendand middle-sections touching one another in planes right angles to the front wall of t e boiler,

laced at the said middle-sectionshaving water filled front portions f, lining the front art of the fuel magazin e and having their ower part sloplng down against the rear and forming water cooled supports for the grate-bars which are situate between" the lower parts of the said front portions said supports having intervals between their rearends and the bottom of the ashpit in such a manner that ashes and clinkers can be drawn out of the combustion chamber throu h said intervals, the side sections of the oiler having air channels a therein which communicate with the combustion chamber.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses' ANDERS-BORCH BECK. Witnesses:

J. NIELSEN, J umas Aaaoaano. 

